New gas vehicle have run the 5w20 oils now for some time.. and yes, they claim a 2 percent increase in fuel economy. However the hd diesel engines are design to run on a thicker oil , accouting for wear, and lowered oil pressure at the far end of the oil journals.... Running a thin oil in an engine with lots of wear is a sure fire way to finish it off.
Newer engines can design around the thinner oils by building larger volume oil pump,, not higher pressure and a bigger relief valve so the cold pressure is controlled better. They can also change the width and design of the bearing surfaces. AND they can see an increase in fuel economy.
I was hoping they would come out with a pre "catalyst" hd diesel oil, higher in zinc and phosphorous... for us older equipment users, as it was the best oil known.. newer oils lowered these additives for the emission systems at the expense of wear on our engines.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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